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Recent questions tagged class 12
Questions
What is brood parasitism? Give an example. What adaptation has evolved in this phenomenon?
cbsc
class 12
biology
organisms and population
sec-c
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Anand on a visit through an under the ocean aquarium found that many sea anemones are attached to hermit crab shells, sucker fisher attached to the ventral surface of sharks and clown fish living among the sea anemones. He wondered whether all these associations are of the same type; can you help him to arrive at the correct conclusion.
cbsc
class 12
biology
organisms and population
sec-c
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Mr. Ram on a trip to Rohtang Pass suddenly experienced heart palpitations, nausea, fatigue etc on reaching the destination. Suggest the reasons for his sudden deterioration of health and also state whether his body will withstand this problem if he stays there for long and how?
cbsc
class 12
biology
organisms and population
sec-c
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
What do you mean by competitive release?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
What adaptation have parasites evolved?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
What characteristic of soil determine the vegetation? How are these different at different places ?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Which is the deepest dwelling algae- red, green or brown, why?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
What is the importance of light for organisms? How do deep sea organisms get their energy ?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
How does temperature affect distribution of animals? Name two types based on their temperature tolerance.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
How are the four levels of biological organisations in ecology interrelated ?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
How have plants developed defence against predators ?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
How have prey reduced impact of predation ?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
What is Gause Competitive Exclusion Principle?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
At high altitudes places like Manali or Mansarover we suffer from altitudes sickness this is because in low atmospheric pressure, body does not get enough oxygen, but gradually the problem is over. How did our body solve this problem?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
List four features which enable the Xeric plants to survive in the desert conditions.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Mention the attributes which a population has but not an individual organism.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Differentiate between stenohaline and euryhaline organisms.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Generally thermo regulation is energetically expensive for many organisms. So, many smaller animals are rarely found in extreme hot or cold climatic condition. Why? Write two specific reasons.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
1920's, in Australia, the prickly pear cactus caused havoc by spreading rapidly over millions of hectares of rangeland. How it was brought In the early under control. What term is used for such methods of controlling the prey?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
"Snow leopards are not found in Kerala forests and tuna fish are rarely found beyond tropical latitude in the ocean". Study the above two cases and states the possible reasons for the same.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
If a marine fish is placed in fresh water aquarium, will the fish be able to survive? Why?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
Study the graphical representation shown below and mention the conditions responsible for the curves 'a' and 'b' respectively.
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
What type of growth status the following pyramid represents ?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 23, 2019
by
priyanka.clay6
1
answer
(i) How and at what stage does Plasmodium enter into a human body ? <br> (ii) Why does the victim show symptoms of high fever?<br> (iii)With the help of a flow chart only, show the stages of asexual reproduction in the life cycle of the parasite in the infected human.
cbsc
class 12
biology
human health and diseases
sec-c
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
The immune system of a person is supressed. He was found positive for a pathogen in the diagnostic test ELISA. <br> a. Name the disease, the patient is suffering from. <br> b. Which pathogen is identified by ELISA test? <br> c. Which cells of the body are attacked by the pathogen ? <br> d. Suggest preventive measure of the infection.
cbsc
class 12
biology
human health and diseases
sec-d
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
The pathogen of a disease depends on RBCs of human for growth and reproduction. The person with this pathogen suffers with chill and high fever. <br> a. Identify the disease. <br> b. Name the pathogen. <br> c. What is the cause of fever ? <br> d. Represent the life cycle of the pathogen diagrammatically.
cbsc
class 12
biology
human health and diseases
sec-d
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
Answer the following with respect to Cancer. <br> a. How does a cancerous cell differ from a normal cell. <br> b. Benign tumour is less dangerous than malignant tumour. Why ? <br> c. Describe causes of cancer. <br> d. Mention two methods of treatment of the disease.
cbsc
class 12
biology
human health and diseases
sec-d
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
Describe the asexual and sexual phases of life cycle of Plasmodium that causes malaria in humans.
cbsc
class 12
biology
human health and diseases
sec-d
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
Malarial parasite 'Plasmodium' completes its life cycle in two hosts. Draw its complete life cycle and explain various stages it follows throughout its life.
cbsc
class 12
biology
human health and diseases
sec-d
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
A person claimed that he has seen sounds, heard colours and smelt light. <br> a. What could be the possible reason ? <br> b. Name two chemicals responsible for this condition. <br> c. Mention any one source for these chemicals.
cbsc
class 12
biology
human health and diseases
sec-c
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
A patient has lost his immunity. <br> a. Name the disease associated with it. <br> b. Name the confirmatory test to diagnose the disease. <br> c. Why did he lose his immunity?
cbsc
class 12
biology
human health and diseases
sec-c
asked
Apr 22, 2019
by
priyanka.clay6
1
answer
Why should biological control of pests and pathogens be preferred to the conventional use of chemical pesticides? Explain how the following microbes act as biocontrol agents: <br> (a) Bacillus thuringiensis <br> (b) Nucleopolyhedrovirus.
cbsc
class 12
biology
microbes in humans welfare
sec-c
asked
Apr 20, 2019
by
priyanka.clay6
1
answer
One student has drawn mRNA but he made some mistake in codons
cbsc
class 12
biology
molecular basis of inheritance
sec-c
asked
Apr 20, 2019
by
priyanka.clay6
1
answer
Kangaroo rats can survive in the absence of an external source of water. How do they adapt themselves to such conditions?
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
a) Which type of growth curve does it represent? <br> b) What do the notations represent in the given equation? <br> $\frac{dN}{dt} = rN [\frac{K-N}{K}]$
cbsc
class 12
biology
organisms and population
sec-b
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
How is competition avoided in nature?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Gause's competitive exclusion principle, where does this apply?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
How is liver fluke adapted to parasitism ?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
What is brood parasitism?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Why is female mosquito not considered a parasite?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
What is the relationship between egret and grazing cattle? Why?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
How is orchid ophrys pollinated ?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Will the distribution level of species be affected by gradual increase in temperature? Say briefly.
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Predators are prudent. Why?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Write what do phytophagous insects feed on?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
An organism has to overcome stressful condition for a limited period of time. Which strategies can it adopt to do so?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
In biological control method, one living organism is used against another to check its uncontrolled growth. Which kind of population interaction is involved in this?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Calculate the death rate if 6 individuals in a laboratory population of 60 fruit flies died during a particular week.
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Define diapause. Which organisms exhibit it?
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
Fresh water animals are unable to survive for long in sea water. Give reason.
cbsc
class 12
biology
organisms and population
sec-a
asked
Apr 19, 2019
by
priyanka.clay6
1
answer
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